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- W2284698605 abstract "Abstract The pre-eruptive storage conditions and volatile budgets were constrained for magma erupted with Plinian intensity from Quilotoa volcano in Ecuador in AD 1280. Geothermobarometry, solubility modeling, and petrologic observations were combined to estimate magma temperature, pressure, oxygen fugacity and concentrations of H 2 O, CO 2 and S in the melt phase. The moderately oxidized (NNO + 1.63) magma was found to have resided between 4 and 11 km, under associated pressures of ~ 130–340 MPa and a temperature of 780 ± 20 °C. Variability in estimated storage pressures, melt volatile concentrations (4.8 ± 1.5 to 8.8 ± 2.8 wt.% H 2 O and 0 to 447 ± 170 ppm CO 2 ), Na 2 O–MgO–H 2 O trends and a decrease in vapor bubble volumes in the glass inclusions suggest that the magma under Quilotoa concomitantly degassed and crystallized in the early stages of magma ascent, with maintained high H 2 O suppressing crystallization thereafter. H 2 O concentrations may have been partly buffered with volatile input from a deeper reservoir of chemically similar magma prior to the AD 1280 eruption. The Quilotoa deposits are thus thought to represent a homogenous chemically-buffered zone within an even larger-volume intermediate body that periodically erupts geochemically uniform deposits in a volatile-oversaturated system." @default.
- W2284698605 created "2016-06-24" @default.
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- W2284698605 date "2016-03-01" @default.
- W2284698605 modified "2023-10-02" @default.
- W2284698605 title "P–T–X evolution of the 1280 AD Quilotoa dacite" @default.
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- W2284698605 doi "https://doi.org/10.1016/j.jvolgeores.2015.11.024" @default.
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